Carburetor



Jan. 24, 1928;

1,657,143 A. ARKLEY CARBURETOR Filed Jan, 3, 1927 2 Sheets-Sheet 1 Fig. 1.

Fig. 2.

INVENTOR. 2

A TTORNEY.

A. ARKLEY CARBURETOR Jan. 24, 19 28.

2 Sheets-She et 2 Filed Jan. 1927 WENT M- Z A TTORNE Y.

Patented Jan. 24, 1928.

UNITED STATES PATENT oF ALLEN ARKLEY; OF'SANIA BARBARA, CALIFORNIA.

Application filed Januar 's, 1927'. Serial No. 158,436.

thereto to control the fuel discharge into the carburetor chamber; to provide a earburetor structure wherein there is lncorporated a venturi movable 'to and fron ithe' throttle valve controlling the entrane'e of an into the carburetor for mixing w th the fnel discharge; to provide a structure Where'- in the air adnntted into the niining chainber' throughout the entire circninferenti z tl are-Li of the/chamber ensurh annifor'n min-mt andcarhuretioii; to provide operat' in meansfor the throttle: valve and venturi \vh bv thesaineniayhbe sin a-neously operated linearly of the chinnber tofand fron each other and wherein the throttle valve in its movement actuates the movement of the venture.

Other objects are to provide a carburetor the operation of Whichaffords choke control, h a ma or control from the main air lnlet port tothen'iixinp; chambelu Other ob ects will be agiiperent from the followingdescription.

1 g, i i i p The invention M consists pr marily n ,a force feed carburetor wherein the fuel 1s discharged into the mixing"chamber in a jetstreani under pressure, and wherein the linear movement of thethrottle valverelative to thedischarge nozzle increases or dil'l'li chin bet, and wherein the movement oftlie venturi eonstituting the mixing chamber au ton'iaticelly regulates; the suppl v of air for i i i i' s nes the fuel dischargeinto thennxing carburetion dependent on the position of thethrottle valve relativelyto theneedle value. I I V t lfi iththe above' nentioned and other objects, in view, the. invention consists in thenovel construction and-combination of parts hereinafter described, illustrated in the accompanying dr kings and setf forth initheclairns hereto apipended it being ,un-

derstood that variouschanges in the form,

proportion, size andn inordetailsv of, con struction Within the scope of the claims may be resorted to without departing frorn the;

spirit 'or saci'i'ficing'any of the advantages of the 1nvent1on.

To more fully comprehend the invention} referencels directed to the accompanying drawings, wherein p v T. b g.) 15 a view in elevation of the prefei'red embodiment of my invention.

Fig i is a similar view-taken at' right angles to the illustration shown in Fig? 1. Fig 3 is a view in top plan. Fig; e is vertical central sectional viev'v on ll I 1Q4 f, OfFlg.

Fig. 5 's a transverse sectional View taken online 5- 5 of and .4.

Fi 6 is a transverse sectional view taken on line 6 6 of Fig-3:2, and

Fig; 7 is a transverse sectional view taken on line 7 7 of Figs. 2 and 4t.

Referring moreparticularly to the drmv ings wherein like Cher-actors of reference designate correspondingparts, 1 indicates a tubular carburetor shellniounting at one end an attaching plate 2 preferably thread, ed thereon as at 3 for securing. the discharge endof the carburetor shell to a motor or thel ike The oppositeend of the'shell is adapted to be closed by a platet attached thereto in any suitable manner by scre tvs 5. The plate, carries on inner face a tubulannozzle 6 disposed concentrically of the shell 1, and tapered at its end at 7 in needle" formation. Thehfuel feed bore 8 of the nozzle opens throughlateralports 9 at its needle end 7, andat its opposite end is adapted to communicate through a con nection or elbowlO with a suitable pressure fuel feed device 11, that einbodunent illustrated representing nhat is coinn onlv i y i v termed the auto pulse lnagnetlcfuel pump, the construction and formation of which forms no part of thepresent invention.

VVhilethisfomi of fuel feed device is vertical ports 12 formed in the surface of the shell ,1. The area 0f these ports is adapted to be controlled by a cylinder valve 13 surrounding the carburetor shell 1, said valve being provided circumferentially with a plurality of air inlet ports 14 of asize corresponding to the ports 12.

Any suitable mechanism may be employed for rotating the valve 13about the shell 1. Slidably mounted within the carburetor shell 1 with its periphery in frictional contact with the inner surface of the shell wall is a Venturi tube 15, and upwardly from said Venturi tube 15 extends a stem 16, the upper end of which bears against a cam surface 17, the present embodiment being illustrated as formed on theinner face of the member 4. To the lower end of the nozzle 6 is threaded a throttle valve 18, the periphery of which has frictional contact with the inner wall surface ofthe shell 1, and said throttle valve through said threaded connection is adapted for axial rotation about the nozzle 6 with the needle end 7 of the nozzle adapted to project through an outlet orifice 19 disposed concentrically of the lower conical end 20 of the throttle valve. The end of the outlet orifice 19 has removably positioned therein a ported plate 21 which controls the effective discharge area of the orifice 19 through which fuel passing from the ports 9 and entering the orifice 1D is discharged from the latter into the mixing chamber formed by the venturi 15. The throttle valve 18 is provided with a bore 22 extending longitudinally therethrough, and in which is slidably received the stem 16, a spring 23 surrounding the stem and bearing on the end of the throttle valve 18, and held under compression by a member 24 illustrated in the form of a cotter pin, maintains the upper end of the stem 16 in contact with the cam surface 17. Axial rotation is imparted to the throttle valve 18 by operation of the throttle valve operating collar 25, connected with the throttle valve by a screw member 26, which extends through and operates in a slot 27 formed in the surface of the shell 1 above the ports 12, as illustrated in Figs. 1 and 5. An auxiliary air opening or inlet, commonly termed the low speed air supply, is admitted into the shell 1 at a point preferably below the end ofthe venturi 15 through an air inlet opening .28, which is conventionally illustrated in the drawings.

Any mechanism for axially rotating the members 13 and25 on the carburetor shell 1 is not deemed necessary to be illustrated, as any suitable form of mechanism may be employed.

lVith fuel supplied under pressure into the bore 8 of the nozzle 6, it will be observed that with the throttle valve 18 axially rotated on the nozzle 6 to seat its interior end in the opening in member 21, the entrance of fuel into the venturi15 will be precluded.

In this position of the throttle valve, the

wall

upper edge of the Jenturi tube will circumferentially seat on the periphery of the conical end of the valve 18. When it is desired to admit fuel into the mixing chamber formed by the venturi 15, the same is accomplished by rotating the collar :25 to linearly move the throttle valve 18 toward the discharge end of the nozzle 6. This movement will regulate the operating area of the fuel discharge around the needle end 7 of the member 6 and at the same time will cause a separation or unseatin between the adjacent ends of the throttle valve 18 and venturi 15, admitting a supply of air circumferentially of the fuel supply, discharging anially into the Venturi tube 15. This niovement increases or decreases autoinalieally in flUCQl'ClZlllCG with the movement of the throttle valve 18 linearly of the nozzle 6 to in crease or decrease the fuel flow from the port in the member 21. The maximum quantity of air admissible through the ports 12 may be varied by adjusting the member 13 to vary the effective area of said ports.

I claim 1. A carburetor including a chambered body formed with an air inlet port and a mixture discharge, a fuel feed nozzle discharging into the body chamber, a linearly movable throttle valve associated with the nozzle for controlling the fuel discharge therefrom, a linearly movable Venturi tube associated with the end of said throttle valve and within which said valve is adapted for circumferential seating; means for axially rotating said valve, a connection between said valve and Venturi tube whereby axial rotation is imparted to the latter, and a cam for acting on the Venturi tube during its axial rotation to move the same relative ly to said valve.

2.11 'arburetor including a chambered body formed with an air inlet port and a. mixtu re discharge. a fuel feednozzle cxlend ing axially into the body chan'iber and discharging thereinto at a point opposite the air inlet port, a throttle valve provided with a central here into and through which said nozzle is adapted to extend. a threiulcd connection between said throttle valve and nozzle, said throttle valve provided with a conical end, a Venturi tube linearly movable within said body chamber and within which said conical valve end is adapted. for cir cumferential seating, a stem extended from said Venturi tube and passing through a guide opening in said valve, a spring for normally drawing said Venturi tube toward the conical end of said valve, a cam coacting with the end of said stem, and a ring surrounding said body and having operating connection with said valve whereby the same is caused to rotate about said stem.

3.1K. carburetor including a chambered body formed wlth an air inlet port and a circumferential seating; and means for simultaneously moving said Venturi tube and throttle valve in relatively opposite di- 10 rections.

In testimony whereof I have signed my name to this specification.

ALLEN ARKLEY. 

